I am looking for big 2 sided doors that open fully as big as the interior dragonreach gates .....

I don't think so. They made it specifically for the entrance to Dragonsreach as far as I know.

Assuming I am thinking of the right door, I think there is a large Dwemer door that is the same size. Of course it is made of gold (or whatever) but it could be reskinned I guess.

I 'll have too look for it , unless you have the ID ?
does it opens fully ? Couse I can replace the doors then with others custom made so I can link the antechamber of my throne room with the double doors without needing to load a teleport ...

helgengate01 is double-sided, opens all the way and is very large

We're talking about the door that transitions you between Whiterun and the main cell of Dragonsreach right? DweDoorLarge01 seems to fully open.

Something I just noticed, you are planning on using the Dragonsreach meshes right? Because when I deleted the default door to see how the Dwemer one looks I noticed that the mesh has a divider in the middle of the doorway, which means if you used a fully opening door the little wooden beam might get in the way.

Anyways, the Dwemer door is a little taller than the door frame. It also has little notches, for lack of a better term, on the top corners.

I can edit in 3dsmax ...